/// <summary>
/// Given a condition and the input values, evaluate the condition
/// </summary>
/// <param name="condition"></param>
/// <param name="inputValues"></param>
/// <returns></returns>
internal static bool EvaluateCondition(string condition, InputValues inputValues)
{
if (string.IsNullOrWhiteSpace(condition))
{
return(true);
}
Node treeRoot = ConstructExpressionTree(condition);
return(EvaluateExpressionTree(treeRoot, inputValues));
}
/// <summary>
/// Given an expression tree, evaluate the expression
/// </summary>
/// <param name="top"></param>
/// <param name="inputValues"></param>
/// <returns></returns>
internal static dynamic EvaluateExpressionTree(Node top, InputValues inputValues)
{
if (top == null)
{
return(false);
}
dynamic leftReturn = false, rightReturn = false;
if (top.Left != null)
{
leftReturn = EvaluateExpressionTree(top.Left, inputValues);
}
if (top.Right != null)
{
rightReturn = EvaluateExpressionTree(top.Right, inputValues);
}
if (top.ValueType == PredefinedType.Custom)
{
// check if number and return number
int num;
if (int.TryParse(top.Value, out num))
{
return(num);
}
// check if bool and return bool
bool bl = false;
if (bool.TryParse(top.Value, out bl))
{
return(bl);
}
}
if (!textToTokenHash.ContainsKey(top.Value))
{
return(top.Value);
}
else
{
switch (textToTokenHash[top.Value])
{
case PredefinedTokenEnum.AND:
return((leftReturn == null || rightReturn == null) ? false : leftReturn && rightReturn);
case PredefinedTokenEnum.NOT:
return((rightReturn == null) ? false : !rightReturn);
case PredefinedTokenEnum.OR:
return((leftReturn == null || rightReturn == null) ? false : leftReturn || rightReturn);
case PredefinedTokenEnum.GT:
return((leftReturn == null || rightReturn == null) ? false : leftReturn > rightReturn);
case PredefinedTokenEnum.LT:
return((leftReturn == null || rightReturn == null) ? false : leftReturn < rightReturn);
case PredefinedTokenEnum.GE:
return((leftReturn == null || rightReturn == null) ? false : leftReturn >= rightReturn);
case PredefinedTokenEnum.LE:
return((leftReturn == null || rightReturn == null) ? false : leftReturn <= rightReturn);
case PredefinedTokenEnum.EQ:
return((leftReturn == null || rightReturn == null) ? false : leftReturn == rightReturn);
case PredefinedTokenEnum.NE:
return((leftReturn == null || rightReturn == null) ? false : leftReturn != rightReturn);
case PredefinedTokenEnum.TRUE:
return(true);
case PredefinedTokenEnum.FALSE:
return(false);
case PredefinedTokenEnum.OPENPAREN:
case PredefinedTokenEnum.CLOSEPAREN:
return(true);
case PredefinedTokenEnum.DEPTH:
return(inputValues.NextDepth);
case PredefinedTokenEnum.MAXDEPTH:
return(inputValues.MaxDepth);
case PredefinedTokenEnum.ISARRAY:
return(inputValues.IsArray);
case PredefinedTokenEnum.NOMAXDEPTH:
return(inputValues.NoMaxDepth);
case PredefinedTokenEnum.MINCARDINALITY:
return(inputValues.MinCardinality);
case PredefinedTokenEnum.MAXCARDINALITY:
return(inputValues.MaxCardinality);
case PredefinedTokenEnum.NORMALIZED:
return(inputValues.Normalized);
case PredefinedTokenEnum.REFERENCEONLY:
return(inputValues.ReferenceOnly);
case PredefinedTokenEnum.STRUCTURED:
return(inputValues.Structured);
case PredefinedTokenEnum.VIRTUAL:
return(inputValues.IsVirtual);
case PredefinedTokenEnum.ALWAYS:
return(true);
default:
return(top.Value);
}
}
}
